A kind of preparation method of polylactic acid and plant composite material

A composite material, polylactic acid technology, applied in the direction of coating, etc., can solve the problems of limiting the application of polylactic acid and plant composite materials, low yield of lactic acid to polylactic acid products, low production efficiency, etc., to prevent side reactions such as oxidation, Improve polymerization efficiency and product yield, and improve the effect of yield

Inactive Publication Date: 2016-12-07
JIUJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current method of manufacturing polylactic acid and plant composite materials is generally to use ready-made polylactic acid. The polylactic acid used is generally prepared by ring-opening polymerization. There are many process steps, low production efficiency, high cost, and low yield of lactic acid to polylactic acid products. , limiting the application of polylactic acid and plant composites

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]Wheat husks, rice husks, melon seed husks, sawdust, shavings, branches with a diameter of 0.5cm, crabgrass, foxtail, straw, and wheat straw are subjected to the following pretreatments before use: Shorten branches, crabgrass, foxtail, straw, and wheat straw Cut into 10cm sections, then dry at 70°C to constant weight, then stir and shear for 30 minutes, dry wheat husks, rice husks, melon seed shells, sawdust, and shavings at 70°C to constant weight, then stir and shear for 2 minutes. Weighing 125g mass content is 80% lactic acid aqueous solution, 0.26g hexanediol, 0.5g stannous chloride, 0.5g zinc chloride joins in the reactor, stirs, replaces the air in the reactor with high-purity nitrogen, The reaction system is decompressed to 2000Pa, then the pressure of the reaction system is maintained and the temperature is raised to 110°C for 3 hours, the reaction system is depressurized to 500Pa, then the pressure of the reaction system is maintained and the temperature is raised...

Embodiment 2

[0030] Wheat husks, rice husks, melon seed husks, sawdust, shavings, and branches with a diameter of 3 cm are pretreated as follows: cut the branches into 2 cm sections, then dry them at 70 ° C to constant weight, and then carry out stirring and shearing. Cut for 30 minutes, dry wheat husks, rice husks, melon seed husks, sawdust, and shavings at 40°C to constant weight, and then stir and shear for 5 minutes. Weigh 111g of lactic acid aqueous solution with a mass content of 90%, 0.26g of hexanediol, 0.7g of stannous chloride, and 0.3g of zinc chloride into the reactor, stir well, and replace the air in the reactor with high-purity argon , the reaction system is decompressed to 2000Pa, then the pressure of the reaction system is maintained and the temperature is raised to 110°C for 3 hours, the reaction system is depressurized to 500Pa, then the pressure of the reaction system is maintained and the temperature is raised to 140°C for 3 hours, and the reaction system is recovered w...

Embodiment 3

[0032] The melon seed shells, sawdust, and wood shavings were pretreated as follows: drying at 60°C to constant weight, followed by stirring and shearing for 20 minutes. Weigh 100g of lactic acid, 0.26g of hexanediol, and 1g of stannous chloride into the reactor, stir well, replace the air in the reactor with high-purity nitrogen, depressurize the reaction system to 2000Pa, then maintain the pressure of the reaction system and raise the temperature React at 110°C for 3h, reduce the pressure of the reaction system to 500Pa, then maintain the pressure of the reaction system and raise the temperature to 140°C for 3h, return the reaction system to normal pressure with high-purity nitrogen, add 2g of stannous palmitate under stirring conditions, and react The system was decompressed to 10 Pa, then the pressure of the reaction system was maintained and the temperature was raised to 180°C for 5 hours, and the reaction system was returned to normal pressure with high-purity nitrogen, a...

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Abstract

The invention relates to a preparation method of a polylactic acid-plant composite material. The preparation method of the polylactic acid-plant composite material comprises the steps of pretreatment on plant raw materials, modification prepolymerization on lactic acid, compounding on the polylactic acid and the plant raw materials, post polymerization, hot pressing and aftertreatment. The preparation method of the polylactic acid-plant composite material has the advantages that synthesis of the polylactic acid, mixing of the polylactic acid and the plant raw materials and hot pressing are integrated into a whole, material transferring, transporting and storing links in separate procedures are eliminated, and production efficiency is improved; in a synthesis phase of the polylactic acid, a step-by-step pressure reducing strategy is adopted, energy is saved, so that a smooth and steady reaction process is guaranteed, appropriate atmosphere control and catalyst strategy are combined, so that product purity is guaranteed; a novel catalyst is adopted, and a strategy that catalysts are compounded and used and different catalysts are added in steps is adopted, so that catalysis efficiency is guaranteed, and side reaction is also avoided; and a special molecular weight control strategy is adopted, so that uniform mixing of a polymerization product and plants is guaranteed, and the composite material has good mechanical properties.

Description

technical field [0001] The invention relates to a preparation method of a composite material, which belongs to the field of environment-friendly materials and plant composite materials, in particular to a preparation method of polylactic acid and plant composite materials. Background technique [0002] There are many kinds of plant resources, huge output and renewable. Making full use of plant resources is an important way to realize the sustainable development of human society. Manufacturing environmentally compatible composite materials is an important way to utilize plant resources. In ancient times, composite materials made of plant resources met people's needs in various aspects such as food, clothing, housing and transportation. The development of modern science and technology provides new opportunities for the manufacture of plant composites. There have been some reports in the literature on the manufacture of composite materials using plants as raw materials, but n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L97/02C08J7/04
Inventor 吴传保尹健美曾湘晖
Owner JIUJIANG UNIVERSITY
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